Revert "Add a column for # of editors needed and sort by it (fixes #50)"

This reverts commit c6bbaf9e9b7367bf178e09e8ff4818e757781e0e.

kchen@zapdos:/tmp/puzzle-editing$ php puzzle.php
PHP Parse error:  syntax error, unexpected '[', expecting ',' or ';' in /tmp/puzzle-editing/puzzle.php on line 465